Question, I just recently used the console (f1) to create a creative planet. Once I created it and spawned in the world was flat. I see some of these videos on creative worlds that were made that were not flat.
Did I miss something in the creative process that made the world flat?
The process you are using is not a fully-fledged creative mode - it was somewhat of a precursor to local creative and is still in development, so anything you create there will run the risk of being overwritten with future updates. There is also no connectivity for other players to join your local environment.
If you just want to test you can use these worlds…